What was found
ON TAKEOFF FROM F70 THE GEAR WOULD NOT RETRACT. BURNED OFF FUEL & LANDED BELOW LANDING WEIGHT MINIMUMS. JACKED ACFT & INSPECTED THE NLG & MLG SQUAT SWITCHES. NO DEFECTS NOTED. CHECKED NLG STRUT NITROGEN SERVICE FOUND NLG STRUT UPPER BARREL TO BE BELOW REQUIRED SERVICE. SERVICED UPPER BARREL TO 420 PSI & DEPLEATED TO 380 PSI. ALSO FOUND LOWER NLG BARREL TO BE BELOW REQUIRED SERVICE. SERVICED NITROGEN ON NLG STRUT. CHECK BOTH MLG STRUT & FOUND TO BE WITHIN LIMITS. SWUNG GEAR SEVERAL TIMES WITH NO DEFECTS. IAW MCC LEAK CHECKED THE NLG STRUT & CHECKED NITROGEN SERVICE NO DEFECTS NOTED. SWUNG GEAR SEVERAL MORE TIMES. NO DEFECTS NOTED. WORK DONE IAW MM 27-20-00.